P20FCReductant Pump B Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P20FC sets when the drive signal for reductant pump B reads too low, typically a ground fault on the line or a current draw beyond what the driver allows. Pump B has no published limits. For pump A, Ford's 2023 diesel summary reports the low fault (P208C) when pump current exceeds 5 A or the pump controller draws more than 15 A, checked with the driver off and confirmed after about 8 seconds; a similar logic is likely for pump B but undocumented. The only codegenau manufacturer evidence comes from Ford: 2023–2024 Super Duty and F-650/F-750 6.7L trucks may log P20FC alongside P20FA and P20FD, and the SSMs point to wet or corroded connectors first. Unlike P20FA, the circuit is not open but pulled down; unlike P20FD it is not stuck high.
- What you may notice
- Malfunction indicator lamp on
- DEF system warning and reduced or no reductant dosing
- Restart lockout after the inducement countdown if left unrepaired
- Likely causes
- LikelyChafed wire shorting the pump B control line to ground
- LikelyWater ingress or corrosion in the pump connectors
- PossiblePump B motor drawing excessive current (internal short or tight motor)
- RareFaulty output stage in the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.